How do you know how to install ports? (like vmware3)

[bsdfsse]

For example, I have been trying to install the vmware3 port - and I find 
all kinds of tidbits all over the web about little things that need to 
be done to get it to work.  The information sometimes covers version 
2.0, sometimes 3.2, and sometimes 4.5. If someone just goes in to 
/usr/ports/emulators/vmware3 and does a "make install", how would they 
know what else to do?

I'm new to FreeBSD, maybe I am missing something obvious?